diff options
Diffstat (limited to 'sql/sql_class.h')
| -rw-r--r-- | sql/sql_class.h | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/sql/sql_class.h b/sql/sql_class.h index aa526d5e474..8ccfe3cddd5 100644 --- a/sql/sql_class.h +++ b/sql/sql_class.h @@ -456,6 +456,7 @@ public: */ bool allow_sum_func; + LEX_STRING name; /* name for named prepared statements */ LEX *lex; // parse tree descriptor /* Points to the query associated with this statement. It's const, but @@ -522,8 +523,14 @@ public: /* - Used to seek all existing statements in the connection - Deletes all statements in destructor. + Container for all statements created/used in a connection. + Statements in Statement_map have unique Statement::id (guaranteed by id + assignment in Statement::Statement) + Non-empty statement names are unique too: attempt to insert a new statement + with duplicate name causes older statement to be deleted + + Statements are auto-deleted when they are removed from the map and when the + map is deleted. */ class Statement_map @@ -531,12 +538,14 @@ class Statement_map public: Statement_map(); - int insert(Statement *statement) + int insert(Statement *statement); + + Statement *find_by_name(LEX_STRING *name) { - int rc= my_hash_insert(&st_hash, (byte *) statement); - if (rc == 0) - last_found_statement= statement; - return rc; + Statement *stmt; + stmt= (Statement*)hash_search(&names_hash, (byte*)name->str, + name->length); + return stmt; } Statement *find(ulong id) @@ -550,15 +559,21 @@ public: { if (statement == last_found_statement) last_found_statement= 0; + if (statement->name.str) + { + hash_delete(&names_hash, (byte *) statement); + } hash_delete(&st_hash, (byte *) statement); } ~Statement_map() { hash_free(&st_hash); + hash_free(&names_hash); } private: HASH st_hash; + HASH names_hash; Statement *last_found_statement; }; |